Computational Treatment of Transonic Canard-Wing Interactions.

Abstract : The transonic canard-wing interaction problem is simulated using modified small disturbance (MDS) transonic theory. The wing and the canard are treated in a sheared fine grid system that is embedded in a global Cartesian crude gird. An appropriate far field and asymptotic expression for the velocity potential derived using Green's theorem is implemented. Results are presented for a few canard-wing configurations and compared with available experimental data. The weakening of the wing shock due to the presence of the canard downwash is illustrated in terms of contour pilots. An empirical incidence correction for the wing leading edge vortex gives good agreement with experiment at low incidences. For higher angles of attack, the results indicate that a more sophisticated vortex roll-up and induction model is required. (Author)